SCMC Message Forum  
Go Back   SCMC Message Forum > Pick your poison > Suspension Tech
User Name

Register FAQ Members List SCMC Calendar Search Today's Posts Mark Forums Read

Thread Tools Search this Thread
Old 04-15-2005, 03:22 PM   #1
Got Boost?
tgentry's Avatar
Join Date: Jun 2001
Location: Rockford, IL
Posts: 609
Send a message via Yahoo to tgentry
IRS for '96

Does anyone know the differences between '99 through '04 IRS units?

Besides cat-back and brake hoses, any other parts to make the switch?

If you happen across one for sale in the northern Illinois / souther Wisconsin area please let me know.
Tom Gentry
Life is too short for boring rides!
'06 Schwinn StingRay Spoiler (3 speed conversion)
'03 Giant Team ONCE (Campy goodness)
'00 Bike E E2 Tandem (too many mods to list)
'98 ProFlex Beast (no more elastomers)
'06 Kustom Kruiser Roadster (8 speed conversion)
'74 PPV (Resto-mod project)
'98 E-150 Starcraft Heritage "Black Bart"
'89 Mercedes-Benz 560SEL "Gunther"
tgentry is offline   Reply With Quote
Old 04-15-2005, 04:24 PM   #2
track deprived
Firme's Avatar
Join Date: Apr 2002
Location: Missouri City (Sienna), Tx
Posts: 5,555
99 are 28 spline, the rest are 31 spline.

99 halfshafts are weakest
01 halfshafts are ok for the power but still weak
03-04 halfshafts are the strongest production halshafts, work ok for that power level, but, I have seen an 04 Cobra on drag radials and 500 miles on the ticker snap a halfshaft stagging in front of me at the drag strip.

Moral of that story, wheel hop is a killer.

99-01 differentials have 3.27 gears (in stock form)

03-04 diff. have 3.55 gears (in stock form)

I would definitely put in ALL urethane bushing (IRS, Differential, upper and lower control arms) while you have the IRS out.

And, more than likely, you might need to get 14mm bolts for the front IRS mount as alot of IRS cars came with smaller 12mm bolts from the factory by mistake.

To get the 14mm bolts, go to the dealer and ask for the front control mount bolts to a 99+ GT.

Also, you need to switch the Shocks + springs.
2001 Mineral Grey Cobra Coupe
~#2743 of 3867 Born on 8/6/01
- Magnaflow Catback, Magnaflow X-pipe, 03 Bilstein Shocks/Struts, MM front Coil-Over kit, MM STB, H&R rear Race Springs, MM IRS bushing, MM upper and lower rear Control arm bushings, Custom SFC. MGW shifter(replaced the p.o.s Tri-Ax), a whole slew of MGW pieces

Founding member of the "Texas Demon Hell Snakes who eat small children" secret society
Firme is offline   Reply With Quote
Old 04-16-2005, 10:12 PM   #3
Registered User
InfamousSVT's Avatar
Join Date: Oct 2004
Location: Gastonia, NC
Posts: 1,963
Tom, you have a PM

Also, email me after you get it.
1994 Black on Black SVT Coupe
2004 SVT Cobra Competition Orange - SOLD
1979 Ghia Coupe - SOLD

1994 Chevy S-10 - DailyDriver
InfamousSVT is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

All times are GMT -4. The time now is 02:09 AM.

Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 1999-2017 SCMC, Inc